Controlled Experiments and Variable

The variable that is changed during an experiment is known as the ___________________ variable.

• independent

• controlled

• dependent

Tags

NGSS.MS-PS2-2

The variable that remains the same in an experiment is known as the __________________ variable.

• independent

• controlled

• dependent

Tags

NGSS.MS-PS2-2

The variable that is measured at the end of the experiment is known as the _________________ variable.

• independent

• controlled

• dependent

Tags

NGSS.MS-PS2-2

True or False: an experiment should have many independent variables.

• True

• False

An experiment is being done to determine how light affects the growth of pea plants. One plant is placed in full sunlight, the second in a shaded area and the third in a dark closet. What is the independent variable?

• Type of soil

• Amount of light

• Type of plant

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

An experiment is being done to determine how light affects the growth of pea plants. One plant is placed in full sunlight, the second in a shaded area and the third in a dark closet. What is the dependent variable?

• Growth of the pea plants

• Amount of light

• Type of plant

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is a controlled experiment?

• It is an experiment in which one variable changes and the rest of the variables are kept the same.

• It is an experiment in which all the variables change and only one variable is kept the same.

Why should we test one variable at a time during an experiment?

• It is what has always been done.

• It keeps the experiment fair and achieves accurate results.

• The results are better.

Ayah conducted an experiment using the scientific method. She decided to test if the amount of water affects the growth of tomato plants.

Ayah had 2 tomato plants. She made sure that they had the same amount of soil and were placed in sunlight. Ayah then gave the 1st tomato plant 1 cup of water and the 2nd tomato plant 10 drops of water. She then measured the height of the tomato plants and recorded her results for 2 weeks.

What are the controlled variables in this experiment? Choose all correct answers.

• The type of plant

• The amount of soil

• The place the plants were placed in

Tags

NGSS.MS-LS2-1

Ayah conducted an experiment using the scientific method. She decided to test if the amount of water affects the growth of tomato plants.

Ayah had 2 tomato plants. She made sure that they had the same amount of soil and were placed in sunlight. Ayah then gave the 1st tomato plant 1 cup of water and the 2nd tomato plant 10 drops of water. She then measured the height of the tomato plants and recorded her results for 2 weeks.

What is the independent variable in this experiment?

• The amount of water

• The amount of soil

• The place the plants were placed in

Tags

NGSS.MS-LS2-1